Microsoft has confirmed a number of bugs inflicting set up and Blue Display screen of Demise (BSOD) points impacting Home windows Server 2025 methods with greater than 256 logical processors.
Customers could expertise signs reminiscent of Home windows Server 2025 set up or upgrading processes failing or hanging and server beginning and restarting taking as a lot as three hours or extra in some instances.
They could additionally see blue screens when launching, restarting, or making an attempt to run an app on impacted servers.
Nonetheless, as the corporate explains in a new Home windows launch well being entry, these points are usually not triggered persistently on affected units.
To find out if these recognized points affect considered one of your Home windows Server 2025 methods, open the Home windows Process Supervisor utilizing the CTRL+SHIFT+ESC keyboard shortcut and test if it reveals over 256 logical processors on the Efficiency tab.
Redmond is engaged on a repair, which might be delivered with an upcoming Home windows month-to-month replace. Till a decision is offered, admins can work round these points by limiting the variety of logical processors on affected units to 256 or beneath.
To regulate what number of logical processors are lively, you possibly can comply with these directions:
- Restart your server and enter the UEFI Setup. Navigate via the firmware menus, which can differ by producer.
- Find any choice which lets you alter the variety of cores per socket.
- Set the variety of cores per socket to a worth that ensures the overall variety of logical processors is 256 or fewer. Vital: The entire variety of logical processors is calculated by first multiplying the variety of sockets by the variety of cores per socket after which multiplying that outcome by the variety of logical processors per core.
- Restart the server.
It additionally warned prospects that they could see some textual content seem in English throughout set up when utilizing sure media, reminiscent of CD or USB, to put in Home windows Server 2025, whatever the chosen language.
This solely happens when utilizing the Multilanguage Person Interface (MUI) on Home windows Server media 25100.1742 and later.
Microsoft launched the primary Home windows Server 2025 construct for admins within the Home windows Insider program in January, introducing next-gen Energetic Listing, hotpatching, and SMB over QUIC various ports, which permits switching from the default SMB over QUIC UDP/443 port to some other port.
The corporate introduced over the weekend that Home windows Server 2025 is now typically obtainable, with a free 180-day trial obtainable by way of the Microsoft Analysis Heart.
Home windows Server 2025 is now Microsoft’s newest Lengthy-Time period Servicing Channel (LTSC) launch for Home windows Server.
